Argon plasma coagulators

ERBE APC 3: troubleshooting and error codes

The ServiceForge knowledge base holds 24 documented symptoms for the ERBE APC 3, with 31 ranked causes, 54 diagnostic checks with test points and expected values, and 85 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Argon plasma does not ignite high voltage

Argon gas fails to ignite when applicator is activated pointing at tissue simulator

Ranked causes

1. Insufficient gas flow or gas not reaching applicator (common)
2. High frequency output not reaching applicator or load (common)
3. Applicator or socket defective (occasional)

First check

Verify argon gas supply to applicator

Test point: Gas outlet at applicator
Expected: Gas flows from applicator nozzle

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bipolar HF output power outside tolerance high voltage

Measured HF power in bipolar forcedCOAG mode at Effect 10 does not fall within 96–144 watts.

Ranked causes

1. HF power meter not set to correct load impedance or miscalibrated (common)
2. APC 3 RF output stage degraded or output setting misconfigured (occasional)

First check

Set HF power meter load impedance

Test point: HF power meter impedance selector
Expected: RL = 100 Ohm

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bipolar socket AUTO START not responding

When holding S1 button on VIO test box, test specimen does not activate or activation does not begin after set delay.

Ranked causes

1. AUTO START permission not enabled in Protected settings (common)
2. Delay AUTO START bipolar timer set incorrectly or test timing mismatch (occasional)

First check

Verify AUTO START is permitted in protected settings

Test point: Protected settings menu
Expected: 'Use of AUTO START' shows permitted/enabled

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

MF-U socket bipolar HF output power outside tolerance high voltage

Measured HF power in bipolar forcedCOAG mode at Effect 10 does not fall within 96–144 watts.

Ranked causes

1. HF power meter not set to 100 Ohm load impedance or miscalibrated (common)
2. APC 3 RF output degraded or configuration error on MF-U socket (occasional)

First check

Set HF power meter load impedance to 100 Ohm

Test point: HF power meter impedance selector
Expected: RL = 100 Ohm displayed or confirmed

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

MF-U socket connector type not detected or plugging counter not incremented

Test program does not detect monopolar or bipolar cable type or fails to increment plugging counter after cable insertion.

Ranked causes

1. Cable not fully seated or wrong cable type tested (common)
2. Plugging contact corrosion or socket damage (occasional)

First check

Launch Plugging recognition test program

Test point: Service menu test program list
Expected: Test Program Plugging recognition active and ready

3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

MF-U socket finger switch activation not detected

Pressing CUT, COAG, or simultaneous buttons on electrode handle does not trigger corresponding signals in test program.

Ranked causes

1. Electrode handle not fully connected to MF-U socket or cable fault (common)
2. Test program not running Activation Signals test or software issue (occasional)

First check

Launch Activation Signals test program

Test point: Service menu test program list
Expected: Test Program Activation Signals displayed and ready

4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

APC applicator not recognized in socket

Applicator data record does not appear on display when inserted into APC socket

Ranked causes

1. EEPROM data not communicating or socket not detecting applicator (common)

First check

Verify applicator data record appears on display

Test point: APC 3 socket slot 2 display
Expected: Applicator data record shown on APC 3, slot 2

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Applicator finger switch buttons not responding

CUT, COAG, or ReMode button presses on applicator do not register in test program

Ranked causes

1. Finger switch contact failure or signal line open circuit (common)

First check

Test CUT button activation

Test point: Test program activation display
Expected: Source shows hand + handpiece + APC 3 + socket slot 2; signal shows CUT

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Argon flow measurement out of specification

Gas flow rate does not meet tolerance range at target flow settings

Ranked causes

1. Flow control valve malfunction or blockage (common)

First check

Measure flow at 0.5 l/min target

Test point: Flow meter output
Expected: 0.40 – 0.60 l/min, 0.40 – 0.60
Tools: Flow meter (minimum 10 standard liters capacity)

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Argon system fails to respond to pedal activation

System does not cancel activation or display vacuum message when bottle pressure drops during pedal press

Ranked causes

1. Insufficient input pressure or pressure drop not detected (common)

First check

Observe pressure regulator manometer during pedal activation

Test point: Pressure regulator manometer display
Expected: Pressure should clearly fall when COAG pedal pressed with bottle valve closed

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bipolar socket connector type not detected

After plugging bipolar cable, test program does not display bipolar mode or connector type detection fails.

Ranked causes

1. Bipolar cable not fully inserted or incompatible cable type (common)

First check

Verify connector type detection after cable insertion

Test point: Bipolar socket slot 1
Expected: Display shows 'not plugged' switches to bipolar display

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bottle fill level display mismatch

Fill level percentage shown on VIO 3 does not match pressure regulator manometer reading

Ranked causes

1. Bottle pressure setting does not match test bottle pressure (common)

First check

Compare fill level display with pressure regulator manometer

Test point: VIO 3 bottle fill level window and pressure regulator manometer
Expected: Both readings should essentially match

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Gas leakage detected at 5 bar input pressure caution

Input pressure at manometer falls significantly during sealed unit test

Ranked causes

1. Leakage in test specimen seals or connections (common)

First check

Monitor input pressure over 5 minutes with bottle valve closed

Test point: Pressure regulator manometer
Expected: Pressure does not significantly fall within 5 minutes bar, No significant fall

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

HF output power below specification (monopolar CUT) high voltage

High frequency output power does not meet tolerance range of 288–400 watts in CUT mode

Ranked causes

1. Low RF output from power supply or amplifier stage (common)

First check

Measure HF output power monopolar CUT at Effect 10

Test point: HF power meter output
Expected: 288 to 400 watts, 288 – 400
Tools: HF power meter with RL = 300 Ohm setting

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

MF socket AUTO START thermoSEAL not responding

When holding S1 button on VIO test box connected to MF socket, test specimen does not activate or activation timing incorrect.

Ranked causes

1. AUTO START permission disabled or delay setting not configured correctly (common)

First check

Verify AUTO START permission in Protected settings

Test point: Protected settings menu
Expected: 'Use of AUTO START' shows permitted or enabled

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

MF socket instrument recognition failed

Test program does not display measurement cable data record after plugging into MF socket.

Ranked causes

1. Measurement cable not fully inserted or incorrect cable type (common)

First check

Launch Instrument recognition test program

Test point: Service menu test program list
Expected: Test Program Instrument recognition active and ready to test

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

MF-U socket AUTO START bipolar not responding

When holding S1 button on VIO test box, test specimen does not activate or activation timing is incorrect.

Ranked causes

1. AUTO START permission disabled or delay setting mismatch (common)

First check

Verify AUTO START permission in protected settings

Test point: Protected settings menu
Expected: 'Use of AUTO START' shows permitted/enabled status

3 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

MF-U socket instrument recognition failed

Test program does not display measurement cable data record after plugging into MF-U socket.

Ranked causes

1. Measurement cable not fully inserted or incorrect cable type used (common)

First check

Launch Instrument recognition test program

Test point: Service menu test program list
Expected: Test Program Instrument recognition displayed and active

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Monopolar socket connector not detected

Socket fails to detect plugged patient cable or distinguish between cable types

Ranked causes

1. Socket connector detection circuit malfunction (common)

First check

Detect and count monopolar cable (20192-127) insertion

Test point: Socket detection circuit and plugging counter display
Expected: Connector type detected as monopolar (XM); plugging counter increments by one

1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Monopolar socket does not recognize electrode handle

Electrode handle CUT, COAG, or ReMode button presses do not register when connected to monopolar socket

Ranked causes

1. Electrode handle finger switch or patient cable contact failure (common)

First check

Test CUT button on monopolar electrode

Test point: Test program activation display
Expected: Source shows hand + handpiece + APC 3 + socket slot 1; signal shows CUT

2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Risk of argon gas exposure during cylinder connection caution

Technician may be exposed to argon compressed gas during service tasks requiring cylinder connection

Ranked causes

1. Argon cylinder connection required for service (occasional)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Risk of damage to electrostatically sensitive components caution

Circuit boards and ESD-sensitive components may be damaged by static discharge during repair

Ranked causes

1. Electrostatic discharge damage during handling (common)

First check

Verify anti-static precautions in place before handling components

Test point: Workplace and technician
Expected: Anti-static workbench, grounding armband worn, non-conducting corners for handling

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Risk of electric shock from unprotected wires high voltage

Technician may contact unprotected wires or conductive surfaces while unit is opened and powered

Ranked causes

1. Unit opened while energized (unknown)

First check

Verify APC 3 is disconnected from electrosurgical unit

Test point: Interconnection cable
Expected: Cable disconnected

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Risk of high-voltage exposure from applicators and cords high voltage

Technician may contact damaged insulation on applicators or cords exposing them to over 1000 V

Ranked causes

1. Damaged insulation on applicators or cords (occasional)

First check

Visual inspection of applicators and cords

Test point: All applicator tips and cord lengths
Expected: No visible cracks, cuts, tears, or missing insulation material

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`APC`	System error from Detecting module APC (Argon Plasma Coagulator)	APC module detects internal system error condition	unknown
`APC-1`	CRC check triggers an alarm	CRC check failure during system operation	error
`APC-122`	EEPROM read error	Failure to read EEPROM memory	error
`APC-123`	EEPROM write error	Failure to write to EEPROM memory	error
`APC-128 to APC-134`	Internal system errors	Various internal system malfunctions	warning
`APC-150`	Internal unit temperature exceeds 80°C	Temperature sensor detects >80°C internal temperature	warning
`APC-151`	Controller temperature exceeds 80°C	Temperature sensor detects >80°C controller temperature	warning
`APC-2`	ErrorHandler Buffer Overflow	Error handler buffer exceeded capacity	error
`APC-20 to APC-38`	Internal system errors	Various internal system malfunctions	error
`APC-246 to APC-255`	Internal system errors	Various internal system malfunctions	warning
`APC-40 to APC-46`	Internal system errors	Various internal system malfunctions	error
`APC-50 to APC-59`	Internal system errors	Various internal system malfunctions	error
`APC-5 to APC-8`	Internal system errors	Various internal system malfunctions	error
`APC-A-10`	Input pressure exceeds 7 bar (rel) - Overpressure in gas supply	Gas supply pressure detected >7 bar (relative)	error
`APC-A-11`	Input pressure <3 bar with bottle pressure >25 bar - Vacuum in gas supply	Input pressure <3 bar (rel) AND bottle pressure >25 bar (rel)	error
`APC-A-12`	Input pressure <3 bar with no bottle pressure signal - Vacuum in gas supply	Input pressure <3 bar (rel) AND no signal from bottle pressure sensor	error
`APC-A-13`	Output pressure >2 bar (rel) during activation - Instrument blockage	Output pressure exceeds 2 bar (relative) during activation	error
`APC-A-148`	Bottle pressure <25 bar (rel) - Gas bottle empty soon	Gas bottle pressure falls below 25 bar (relative)	warning
`APC-A-150`	No bottle pressure sensor signal but input pressure OK	No measurement from bottle pressure sensor while input pressure is adequate	warning
`APC-A-151`	Input pressure <3 bar with bottle pressure >25 bar - Vacuum in gas supply	Input pressure <3 bar (rel) AND bottle pressure >25 bar (rel)	error
`GCM`	Gas Control Module error on APC 3	Gas Control Module detects malfunction	unknown
`I-1`	CRC check triggers an alarm	CRC check failure on instrument interface module	error
`I-10`	D-Flash programming error	Failure during D-Flash memory programming	error
`I-11`	P-Flash programming error	Failure during P-Flash memory programming	error
`I-39`	Undefined connector detection or faulty socket	Unrecognized instrument connector or defective socket detected	error
`I-45 to I-50`	Internal system errors	Various internal system malfunctions in Instrument Interface Module	error
`I-57 to I-63`	Internal system errors	Various internal system malfunctions in Instrument Interface Module	error
`I-5 to I-7`	Internal system errors	Various internal system malfunctions in Instrument Interface Module	error
`I-A-30`	1-wire CRC incorrect	CRC check failure in 1-wire instrument communication	error
`I-A-31`	1-wire type incorrectly detected	Instrument type cannot be determined via 1-wire communication	error
`I-A-32`	1-wire no Erbe instrument detected	Non-Erbe instrument connected to socket with 1-wire detection	error
`I-A-33`	Short circuit on IK (instrument recognition) line	Short circuit detected on instrument recognition signal line	critical
`I-A-34`	Activation ID malfunction	Instrument activation identifier not recognized or corrupted	error
`I-A-35`	SK error undefined - Incorrect pin configuration detected	Left/center pin inserted but right pin missing on monopolar/bipolar/MF-U socket	error
`I-A-36`	SK error bipolar - Incorrect pin count for bipolar socket	2 pins detected at monopolar socket during insertion (expected 1 or 3)	error
`I-A-37`	SK error monopolar - Incorrect pin count for monopolar socket	3 pins detected at bipolar socket (expected 2 right + 1 additional)	error
`I-A-38`	Protocol version not compatible with 1-wire	1-wire protocol version mismatch between instrument and system	error
`I-A-40`	One or more buttons detected as pressed on insertion	Button press signal detected when instrument inserted	error
`IIM`	Instrument Interface Module error	IIM detects communication or interface failure	unknown
`S-1`	Checksum calculation application check triggers an alarm	Application software checksum verification failure	error
`S-10`	Mainboard voltage 12V not within ±10%	12V power supply measurement outside acceptable range	error
`S-11`	Mainboard voltage 5V not within ±10%	5V power supply measurement outside acceptable range	error
`S-128`	SCM start triggered by watchdog	System Control Module restarted by watchdog timeout	error
`S-148`	Rotational speed of main fan insufficient	Main cooling fan speed below minimum acceptable threshold	error
`S-159`	Invalid instrument parameters	Instrument parameters not accepted by user interface	warning
`S-3`	Checksum calculation mode list triggers an alarm	Mode list checksum verification failure	error
`S-4`	Checksum calculation version list triggers an alarm	Version list checksum verification failure	error
`S-63 to S-74`	Internal system errors	Various internal system malfunctions on mainboard	error
`S-78 to S-84`	Internal system errors	Various internal system malfunctions on mainboard	error
`S-88 to S-94`	Internal system errors	Various internal system malfunctions on mainboard	error
`S-A-129`	Heat management: High average power output reached	System heat generation reaches elevated threshold	warning
`S-A-130`	Plugged-in instrument is blocked or unsupported	System detects blocked or incompatible instrument connected	error
`S-A-149`	Double footswitch activation	Multiple footswitch activations detected simultaneously	error
`S-A-150`	Undervoltage flag set in RTC chip - Time may be incorrect	Real-time clock chip reports low battery voltage condition	warning
`S-A-152`	Rinsing of APC instrument triggered	APC instrument rinsing cycle initiated	info
`S-A-154`	No footswitch assigned on activation	Activation attempted without assigned footswitch	error
`S-A-155`	No mode for activation source assigned on activation	Activation attempted without assigned mode	error
`S-A-156`	New irregular activation signal applied during regular termination	New activation signal detected while previous activation ending normally	warning
`S-A-157`	No instrument connected on activation	Activation attempted without instrument connected	error
`S-A-163`	IOSK instrument connected to system	Sterile IOSK instrument detected and evaluated	info
`S-A-164`	Instrument was removed or unplugged from system	Instrument disconnection detected during operation	info
`S-A-166`	APC 3 module is not ready for operation	APC 3 module fails startup initialization	error
`S-A-18`	Heat management: Maximum average power output reached	System heat generation exceeds safe operating threshold	warning
`S-A-19`	Maximum activation time reached (maximum ON time)	Activation duration exceeds configured maximum ON time limit	warning
`S-A-198`	EIP ready for operation	External Interface Processor successfully initialized	info
`S-A-199`	EIP disconnected	External Interface Processor connection lost	info
`S-A-200`	IES ready for operation	Integrated Endoscopic Surgery interface successfully initialized	info
`S-A-201`	IES disconnected	Integrated Endoscopic Surgery interface connection lost	info
`S-A-204`	One pedal ReMode footswitch ready for operation	ReMode one-pedal footswitch successfully initialized	info
`S-A-205`	One pedal ReMode footswitch disconnected	ReMode one-pedal footswitch connection lost	info
`S-A-206`	Two pedal ReMode footswitch ready for operation	ReMode two-pedal footswitch successfully initialized	info
`S-A-207`	Two pedal ReMode footswitch disconnected	ReMode two-pedal footswitch connection lost	info
`S-A-208`	One pedal IES footswitch ready for operation	IES one-pedal footswitch successfully initialized	info
`S-A-209`	One pedal IES footswitch disconnected	IES one-pedal footswitch connection lost	info
`S-A-21`	Critical unit temperature has been reached	Unit internal temperature reaches critical threshold	warning
`S-A-22`	Second signal detected with higher priority - Unsupported unit connected	Incompatible module detected connected to ECB	error
`S-A-23`	Unsupported unit connected to ECB	Incompatible module detected connected to extension control board	error
`S-A-24`	Contact monitor assignment when contact detected	Unit detects pre-existing instrument contact before activation	warning
`S-A-29`	Activation attempt with two identical footswitches plugged in	Two footswitches of same type detected during activation attempt	error
`S-A-30`	Two identical footswitches detected	Two footswitches of same type detected during system operation	error
`S-A-31`	Modified module configuration detected	System detects change in internal module configuration	warning
`S-A-32`	Modified socket configuration detected	System detects change in socket configuration during startup	warning
`S-A-40`	Two pedal footswitch pedal pressed during first query	CUT, COAG or ReMode pedal reported pressed on initial system check	error
`S-A-41`	One pedal footswitch pedal pressed during first query	COAG or ReMode pedal reported pressed on initial system check	error
`SCM`	SysCheckMaster error	SCM detects system check failure	unknown

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

Community

0 fixes logged by technicians through their AI, with outcomes, for this model.

ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.